Any cleanroom supply will have plug-in ionized guns that will hook up to a low-pressure air line. The electronics tech industry uses all kinds of
such gadgets and special materials. I don't know about EU sources, but around here in the heart of techie land, such stuff is readily available
from multiple sources. But the key to this anywhere is probably to look that direction rather than to photo stores. Another excellent collection of sources would be used lab or printing gear outlets. Sometimes really nice stuff can be had downright free, since many traditional pro photo labs and printing houses have gone out of business for one reason or another. The average camera store in this day and age probably wouldn't
even know what you were talking about.
I have a 1" Staticmaster brush I bought back in the early "80's" and when I first used it I could actually see the dust jump, ever so slightly, from the negative to the brush hairs themselves. Of course the radioactive charge has long expired and all I have now is a 1" brush. With refills costing an arm, leg and left testicle it looks like I'll always have just a 1" brush. The cost increase is far beyond the cost of inflation and I wouldn't care if I had more money than brains, I still wouldn't buy a refill knowing I'm being taken advantage of. There's a sucker born everyday, but this guy wasn't born yesterday. I'll try the Ilford cloth or just keep using my fine sable brush and blower. JW